That depends on the location. It's a whole weekend so count the drive out to the site, set up, exploring, going back, party activities, waking up, maybe exploring again, packing up, and going home. Suggest a location and we'll all toss it around.
That's about what I've been doing. I told her give me a time, place, and a date, and I'll show up in a pinstripe tux. The most I've done was talk her out of her original idea because I won't cough up over 20K for just one day. I got mods and shit to do.
We had a 'mock' wedding at our house.. Went through the motions of a wedding but wasn't legally married. All our friends/family showed up. Total cost- $1,400
The next day we jumped on a plane and went to Jamaica, spent 7 days there all inclusive and ended up getting married on the beach, just her and I, barefoot wearing all black. Had 24 hour butler service, private villa with private pool/spa, all you can eat/drink, etc. Was very nice. - Total cost $4,700 (now that same package is under 3k which includes air fare)